The phrase "big jolt" refers to a sudden and strong shock or surprise that can cause a significant impact or change in a situation or person's life. Full definition
When met with big jolts through the suspension it does feel less rigid, and with the car in Sport mode there is a slight resonance felt throughout the car. (evo.co.uk)
There were not big jolts in this car and up - and downshifts are very good most of the time. (Autoweek.com)
While those films (or, more specifically, their franchises) are about big jolts and loud noises, (waytooindie.com)